Prime Minister John Key expects he'll be having a chat with US President Barack Obama at the nuclear terrorism summit in Washington next week.
It's the fourth and last summit for world leaders to discuss ways to counter the threat of nuclear terrorism.
Asked today whether he would be meeting President Obama, Mr Key told reporters he didn't think a formal bilateral meeting had been arranged.
"There will be plenty of opportunities to have a chat with him," Mr Key said.
"I would raise a range of things, everything from domestic US politics to the Trans-Pacific Partnership."
While he's in Washington Mr Key will give a speech to the US Chamber of Commerce and meet senior trade officials.
He said yesterday he would be talking up the benefits of the TPP.
"During my visit I will set out the arguments in favour of the TPP," he said.
"My message will be that the agreement is good for the United States and the other 11 member countries, including of course New Zealand.
"It will set a new standard for trade and investment in one of the world's fastest-growing and most dynamic regions, creating jobs and boosting incomes."
The TPP is a political hot potato in the US, where it is strongly opposed by the Republican Party.
Republican presidential front-runner Donald Trump has said it's "a horrible deal" while Hillary Clinton, expected to secure the Democratic nomination, doesn't think it's good enough in its present form.
Mr Key will be in Washington from March 29 to April 1.